27jun11 I bought a cheap camera from china grabber, the HDDV-2200 VIDEO CAMCORDER with an 8X DIGITAL ZOOM SVP that looks something like this one and when there is heavy duty infrasound present, the viewer shows a rolling motion around the curtains with sunlight coming in. Here are some examples on my.photobucket.com that I took: http://s936.photobucket.com/albums/ad206/asdfghjkl11/INFRASOUND%20Flickker%202010/?action=view¤t=129southin.mp4 http://s936.photobucket.com/albums/ad206/asdfghjkl11/INFRASOUND%20Flickker%202010/?action=view¤t=PICT0042.mp4 http://s936.photobucket.com/albums/ad206/asdfghjkl11/KLONG%20TEN%20%20village%20watched/?action=view¤t=18mar11klongteninfrasound.mp4 http://s936.photobucket.com/albums/ad206/asdfghjkl11/Marine%20ka-band%20microwave%20infrasound%20ultrasound/?action=view¤t=infrasoundbaby.mp4 http://s936.photobucket.com/albums/ad206/asdfghjkl11/Marine%20ka-band%20microwave%20infrasound%20ultrasound/?action=view¤t=chatdree27aug10.mp4 http://s936.photobucket.com/albums/ad206/asdfghjkl11/ONGOING%20RADIATION%20POISONING/?action=view¤t=infrasoundatklongten-2.mp4 You can also do a spectrum analysis and it will clearly show the presence of infrasound. Cheap cameras work best.